import java.util.Scanner;

public class 登陆注册 {
    public static String arr1[] = new String[3];
    public static String arr2[] = new String[3];
    static int index = 0;

    public static void main(String[] args) {
        arr1[0] = "heima";
        arr2[0] = "123456";
        while (true) {
            print();
            Scanner scan = new Scanner(System.in);
            System.out.println("请选择功能：");
            String str = scan.next();
            if (str.equals("1")) {
                login();
            } else if (str.equals("2")) {
                register();
            } else if (str.equals("3")) {
                show();                         //用户退出
                break;
            } else if (str.equals("0")) {
                System.exit(0);
            } else {
                System.out.println("输入错误");
            }
        }
    }
    		public static void login() {
			for (int i = 0; i < 3; i++) {
				Scanner scan1 = new Scanner(System.in);
				System.out.println("请输入用户名：");
				String str1 = scan1.next();
				Scanner scan2 = new Scanner(System.in);
				System.out.println("请输入密码：");
				String str2 = scan2.next();
				for (int i1 = 0; i1 < arr2.length; i1++) {
					if (str1.equals(arr1[i1]) && str2.equals(arr2[i1])) {
						System.out.println("登录成功！");
						return;
					}
				}
                System.out.println("登陆失败，请从新输入！");
            }
        }
        		public static void register() {
			Scanner scan1 = new Scanner(System.in);
			System.out.println("请输入用户名：");
			String str1 = scan1.next();
			Scanner scan2 = new Scanner(System.in);
			System.out.println("请输入密码：");
			String str2 = scan2.next();
			boolean flag = true;
			for (int i = 0; i < arr1.length; i++) {
				if (str1.equals(arr1[i])) {
					System.out.println("用户名已存在");
					flag = false;
				}
			}
			if (flag == true) {
				index++;
				if (index < arr1.length) {
					arr1[index] = str1;
					arr2[index] = str2;
					System.out.println("注册成功！");
				} else {
					add();
					arr1[index] = str1;
					arr2[index] = str2;
					System.out.println("注册成功！");
				}
			}
		}
    public static void show() {
			for (int i = 0; i < arr1.length; i++) {
				if (arr1[i] != null) {
				System.out.println("用户名：" + arr1[i] + "," + "密码：" + arr2[i]+ "\n");
				}
			}
		}
    public static void add() {
			String newarray1[] = new String[arr1.length + 3];
			String newarray2[] = new String[arr1.length + 3];
			System.arraycopy(arr1, 0, newarray1, 0, arr1.length);
			System.arraycopy(arr2, 0, newarray2, 0, arr1.length);
			arr1 = newarray1;
			arr2 = newarray2;
			show();
		}
		public static void print() {
			System.out.println("--------------------黑马管理系统 --------------------");
			System.out.println(" 1.登录功能 (login) ");
			System.out.println(" 2.注册功能(register) ");
			System.out.println(" 3.查看(show) ");
	         System.out.println(" 0.退出(exit) ");
			System.out.println("--------------------黑马管理系统 --------------------");
		}

}
